In mathematics, which prefix refers to 10 to the power of 21?

More Questions:

Who was credited with developing the original recipe for Angostura Bitters?

What soft drink used the ad slogan "Obey your thirst" for almost two decades?

In "The Wizard of Oz', what was Dorothy's uncle's name?

Who is the subject of Jean Anouilh's play "L'Alouette"?

In what country would you find the active volcano "Santorini"?

On which Caribbean island are the Blue Mountains?

Lanzarote is part of which island group?

Where is the Parthenon located?

What famous rapper's real name is Chris Bridges?

Who is The Fastest Mouse in All of Mexico?

Who was known as "Moses" of the Underground Railroad?

President William McKinley was a member of what political party?

Who invented the cash register in 1879?

Who commanded the American forces in Vietnam until 1968?

Who was the first US President born outside the 13 original states?